Cal. Health and Safety Code § 11362.76

(a) A person who possesses an identification card shall: (1) Within seven days, notify the county health department or the county’s designee of any change in the person’s attending physician or designated primary caregiver, if any. (2) Annually submit to the county health department or the county’s designee the following: (A) Updated written documentation of the person’s serious medical condition. (B) The name and duties of the person’s designated primary caregiver, if any, for the forthcoming year. (b) If a person who possesses an identification card fails to comply with this section, the card shall be deemed expired. If an identification card expires, the identification card of any designated primary caregiver of the person shall also expire. (c) If the designated primary caregiver has been changed, the previous primary caregiver shall return his or her identification card to the department or to the county health department or the county’s designee. (d) If the owner or operator or an employee of the owner or operator of a provider has been designated as a primary caregiver pursuant to paragraph (1) of subdivision (d) of Section 11362.7, of the qualified patient or person with an identification card, the owner or operator shall notify the county health department or the county’s designee, pursuant to Section 11362.715, if a change in the designated primary caregiver has occurred.